Ncert intext question of class 10 of chapter 2
Q1. You have been provided with three test tubes one of them contains distilled water and other two contain an acid solution and a basic solution ,respectively .if you are given only red litmus paper how will you identify the contains of each test tube? ANSWER--> (I) first dip the red litmus paper in each of the three test tubes the tube in which it turns blue will indicate the basic solution . (II) Now, dip this blue litmus paper formed in (I) in the remaining two test tubes the tube in which again changes back to read indicate the acidic solution . (III) the remaining tube in which neither red litmus turn blue litmus turns red contain the distilled water . Page22 Q1- why should curd and sour substance not be kept in copper vassels ? ANSWER-----> curd and sour substances are acidic in nature the acid present in curd and sour substances react with metals surface of brass and copper vassals to produce toxic compounds which are not fit for human consumption in short we can sa...

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